/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package br.ufc.si.livraria.servlets;

import br.ufc.si.livraria.comandos.CmdAtualizarLivro;
import br.ufc.si.livraria.comandos.CmdCadastrarUsuario;
import br.ufc.si.livraria.comandos.CmdCadastrarLivro;
import br.ufc.si.livraria.comandos.CmdEditarLivro;
import br.ufc.si.livraria.comandos.CmdExcluirLivro;
import br.ufc.si.livraria.comandos.CmdLogin;
import br.ufc.si.livraria.interfaces.Comando;
import java.io.IOException;
import java.util.Hashtable;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author Cliente
 */
public class ServletCentral extends HttpServlet {

    

     private Hashtable comandos;
    
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
       request.setCharacterEncoding("UTF-8");
       String cmd = request.getParameter("comando");
        Comando comando = (Comando)comandos.get(cmd);

        try {
           String tela = comando.executa(request,response);
           response.sendRedirect(request.getContextPath()+ tela);

        } catch (Exception e) {
             response.sendRedirect(request.getContextPath()+ "/index.jsp");
             e.printStackTrace();
        }
    } 

    @Override
    public void init(){

    Comando cmdo;
    comandos = new Hashtable();
    cmdo = new CmdAtualizarLivro();
    comandos.put("CmdAtualizarLivro", cmdo);
    cmdo = new CmdCadastrarLivro();
    comandos.put("CmdCadastrarLivro", cmdo);
    cmdo =  new CmdEditarLivro();
    comandos.put("CmdEditarLivro", cmdo);
    cmdo = new CmdExcluirLivro();
    comandos.put("CmdExcluirLivro", cmdo);
    cmdo = new CmdCadastrarUsuario();
    comandos.put("CmdCadastrarUsuario", cmdo);
    cmdo = new CmdLogin();
    comandos.put("CmdLogin", cmdo);



    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** 
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    } 

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}
